000004869 001__ 4869
000004869 005__ 20141119144600.0
000004869 04107 $$aeng
000004869 046__ $$k2002-06-02
000004869 100__ $$aDu, K.-L.
000004869 24500 $$aA CONTINUOUS DISLOCATION MODEL OF MODE I CRACK

000004869 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference
000004869 260__ $$bColumbia University in the City of New York
000004869 506__ $$arestricted
000004869 520__ $$2eng$$aA dislocation-free zone model for centrally symmetrical mode I crack of finite length is presented on the basis of continuous dislocation distribution model. The crack and the plastic zones at the crack tip are simulated by continuous distribution of dislocations. A simultaneous set of singular integral equations has been derived for the configuration of a crack and two pairs of symmetrical slip bands. This equation set reduces to the case of Chang & Ohr (1981) when the sliding plane is in the prolongation of the crack plane. Numerical results demonstrate that an increase in stress can give rise to dislocation density increment, and thus excite dislocation activities. When the ratio between the lengths of the crack and the dislocation-free zone is 100, the distribution of dislocations is in proximity to that of the case for the infinite-length crack. The derived dislocation-free zone condition simplifies the measurement of experimental parameters.

000004869 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004869 653__ $$aContinuous dislocation model, dislocation-free zone, crack, slip band

000004869 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002
000004869 720__ $$aDu, K.-L.$$iLu, Jia-Bin$$iLi, Ren-Wang
000004869 8560_ $$ffischerc@itam.cas.cz
000004869 8564_ $$s494312$$uhttp://invenio.itam.cas.cz/record/4869/files/458.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004869 962__ $$r4594
000004869 980__ $$aPAPER